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As omnivorous birds, ducks will eat many different foods, and the best foods to offer ducks include: 1  Cracked corn. 2  Wheat, barley or similar grains. 3  Oats (uncooked; rolled or quick) 4  Rice (cooked or uncooked) 5  Milo seed. 6  Birdseed (any type or mix) 7  Grapes (cut in half or quartered if very large)
While all ducks are regularly omnivorous and will try many different foods that may be available, the exact diet any duck follows depends on several factors, including: 1  Species: Some ducks are specialized for particular types of food, such as mergansers with narrow, toothed bills that eat primarily fish.oods Ducks Eat. Wild ducks eat a wide range of different foods and they are constantly foraging for meals and snacks. Foods ducks regularly eat include: 1  Small fish and fish eggs. 2  Snails, worms and mollusks. 3  Small crustaceans. 4  Grass and weeds.